Question

f z is the principal square root of 8, what must be true?

A. z2 = 8, and z is negative
B. z = 82, and z is positive
C. z2 = 8, and z is positive
D. z = 82, and z is negative

Answer 1

Hint: The principle square root can not be a negative number.
\[z=\sqrt{8}\] how can you get rid of the square root symbol on the 8?

Answer 2

divide 8 by 8?

Answer 3

@iambatman

Answer 4

No, that's wrong, how would you get rid of just the square root sign on the 8?
Hint: \[\sqrt{8} \implies 8^{1/2}\]

Answer 5

you square it. @iambatman

Answer 6

Yup, so your answer is?

Answer 7

C?
or do you mean the equation?

Answer 8

Yes, C.